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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52775a029fe1cb2c89a16e9bdda46a0dbc7528289c98c4f3ea4bb99939618599' 
  AND token = 'NBn9kTj13xM7RWDmc+b55cXRQswG0+cNvmqlP6+r/n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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