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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f2c140c50c48c8cb05d10224eb3a81b3287e213d2f0461d6afa110836a4ed0' 
  AND token = 'c1Kdpcnd4L6DKEX7o5yYyIzNsujvc+lUHv2n1DQtsIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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