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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c2de974d8dbd55ad2790efee1caadf7fad828d97f0b4c6b89670fcd19f3d66' 
  AND token = 'e2spSliqrl+cvfsuOHQpou2NJ0o8oILt/jC8Bpekjeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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