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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3feb617edbd46e35e44410ced981329c13dfd00b6e7197b6de68ab3135507b89' 
  AND token = 'NbT8GU8g9jS2Uzqzl4UwXsMO1Nrhy6T1VcCKWrTs918=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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