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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f2b53004fec85026cc70053a5e84967a983f5ae79425a4de1f0a083f625ced' 
  AND token = 'P7VZdYXZ7wy9Twp/0eIFAL1olkvmGXU6k9XEa92ygz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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