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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c6d97581ee449e816a0e92e4204862ea1c0d47e33f213b55227081b236ff55' 
  AND token = 'P+6+NWlwD6r/EPPAU/4nCUc8vWf3AU0JXUu6eGm6sMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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