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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc331d0f9f6c6f05bfb8794633c1361113bab915f4de6fbf6d5625488fdeb1a' 
  AND token = 'wu5d1VMxNX4hRPXN/SNKRX0mN4aALAS7Y5eqB2x49Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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