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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075687206c51b6257892c2543627753830096f6fab4ef1e55bf5667b00d8e78b' 
  AND token = 'qGLYXPkVTEBCoiveQppGLaEQT1lOGCJd3eRq36afbho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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