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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8158ef3c2076d5c6bea9fe83fa77f41ee739af4978ee46b9efa3cee1eddcc78' 
  AND token = 'FeA2f7MPNB6eBR7Zh4mtn/KcGjbIKovHGviAvtyiecA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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