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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe42ff8bf4560c3e245dd2b2c2e108e7d916c7f9d0643f6f763079d8257d5ce1' 
  AND token = 'uXL6j5CF2aVD5xahrWS0to1LebdFH1ll2ngc+hd5o88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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