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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f5907d1d93e3e7f7a4a17e9aae12acc6323797ce1ff524df62688c9f6674be' 
  AND token = 'LfKbarTBdYJOp1IMfCgtu1rkUYdFjrx+tqignmSvVrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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