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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eee72da69ea234f7a14778637f6fa258ec2397fcaf1a9fec317f38d1ca18d17' 
  AND token = 'W/A9D7L+U/pXQBByOK100P7OjOwhJcfPW8Lo+l0ld/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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