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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10ba5396a8f09330776896b101ee29d2464a5376bcf9417fa691cd43b1fa537' 
  AND token = 'y9BbOu60OSN68VD3WoPl7Chrn5/C3RLSVupbkSpzkqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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