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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b28ccc5b7d1ccd1c64226c3a13acba2f32328ad077b12d43997fd9e5c965e92' 
  AND token = 'dY/mGGLwcbj/IGH3ilXMCZ0I9+FpF08KWcMWnx1W8FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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