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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca95ffefecaea444c4a3629f7f4b35c098a9c88d78d34a5d02d59716d2dc8a0' 
  AND token = 'zN33UBniuiL8xcKz+/7mUSX9PJ2atumRAkuSki91Lss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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