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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64cd7aad96f1b270112950c595a181ba7a6a0ec172b4be942ba4281b22460a4c' 
  AND token = 'L0vGM4/zj7ly6vQYmTkDPThaozQJcJP7iZq77L87IOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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