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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de7ccf233d4af13a1f171babe42b59a2cd5ada6c0e4c3b0f809a15f67f47a4b' 
  AND token = '+uyUJ61Dpledzkq087Cpue/0RVclGPCl3b4I2nTRgYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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