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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429b43d0e6aef22757bf5cd1e4bc0ed0992bbe55fdc67886f90209a9e7928967' 
  AND token = 'Y86ZZ3GZeeyYToWgNX6EDCu6EfFqfk6rDJ+7cii5H7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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