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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fabbe60bae13eca4543ef6b32f113bef6a74ec24b92f32a5a05b65c74525bbe' 
  AND token = 'HDb+p5mys/6j3Rg27NpOp+8QIR+mdhT5JfAXVwo948Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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