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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8a9fe12fb32ebf6856e53dae1f1c2b47aa441990ab5aca29dc0b3fa706cd59' 
  AND token = 'enrsYM1J8chpAa3vj9CQNt35/UFCGaBg4TA3aj1pO0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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