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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a13bcae4ad50fe50fc9e876e9c2769da479bd2a6a9b210f35ca76c8a03875c' 
  AND token = 'BZvhglDXOWZw8pDRTLlwwiosm2F9ds6b59PlD7K5ceM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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