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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5def9c66db9fc5013ca7877913700a681850ad1f2cc64f75e96e45031347303' 
  AND token = '8gAVlhtv+41FIIYS/JV8I0p01MRPe9XJP+6LJnip2Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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