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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69437e80ccc09723d76db0e5dcadeeb43dc81195d3f1e35dfcd47350ee0de2c' 
  AND token = 'p11prtkDGWSqCW8LkhzXNVi0lMV1wfgNkXzvL5rq+7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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