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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbc0f22ea7269b113f595c4716f8bd075672cf0bf7cb288166671f3897f9a0b' 
  AND token = 'b0EhTecd0vW7ccUgzo50S/UYO1wWDBRtgImZb0FZlBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}