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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27fc5d95294d4edfe1d758e2e695706bb70ab9c47ac1dbd22d65aa4e0b106c84' 
  AND token = 'o3aO6VZRLH9HxRdOEO7amO8BpvwTv5vfysFQka3g/dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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