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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5bd4ddd00b6939cbdc51ec485c8e4f4a2b4fe8a6e04295ae0f485996835b71a' 
  AND token = 'JDWD7Z2dHY34s8itgUGzvtlbwksmjCPo/etkwUnybpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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