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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa4e397683702fc3f97ab80b6178e4863581c07c3b9363421041920330bf32e' 
  AND token = 'S/KRBnZDmHChbOj63UmyeCOLZe44O3ezJIwi/zClh0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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