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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1178cc73b468821f8df2f9ee3defedd51b234b0eb8ba0e6f49fc1e42bc70d835' 
  AND token = 'Fso78NTICfMNUADaR999AFasEWlbg5nfrJzhtX64Ymo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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