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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6bc5901aba3e1f69e2bd40092bab332669cdf2f97aa0e10b3b4c4102da7e6b' 
  AND token = '0CAJ9YjTOi5zC7kgvIIDn40pJmIVzkzkDWScm0lq8YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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