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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a36bcd609c2608f82197e51e323bf6e67c3074e6b1674192c3b84d69b084c6' 
  AND token = '37Ll4J1oZ+TMvmE8l0eqyx9/S4wVZ4VcoZw7q+vYwkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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