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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85307c8296fa0b7a6f3f22a06d86e8bc6e21efa4f2abcbb8c72d16f66cd0cf82' 
  AND token = 'Q7PO5QuLO3SORRg7jZSQO06+VxZTcHB/o7ckHuXYDaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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