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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b888c87a3fe60b2cddce9f623d55429486b179c6db09e06ac0d7a29517f476cd' 
  AND token = 'McwBFz238MoUFFpQHVp1WMOC0vxy5rj4aOQfm1fMVB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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