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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1d108c6a54992538f1dbbfeda544ec4d1d50d420ab8b85ede8b1c1f0b4c5ac' 
  AND token = 'hCJQj4MXHbikNMCJZLnRX7nZ/NXA55L9gPDDizDRO00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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