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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceeafd7667c30b606da310c1b5db085f8488363a2594eabc2d185d0e564aff3f' 
  AND token = 'wrt+dk0PB5SCEBELd7bnPy2y6w4GtqjRItBnHrIIZAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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