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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8796e8cce2c707681e3e6eb189235fc7630920d6ed82969f3da20e0964920d87' 
  AND token = 'DGlsLA0r8IxQV4WGLJOTjcbMvD+lk+bdIHUpNBUMYh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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