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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd021eb170512497552d5ddb270577ec97899063e283a05d49495a0cc9eff93c' 
  AND token = 'h86KSYzzIAonCw8Zo8RLUd0jfYZ5hZdUHsVDHlVVrQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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