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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccbfc2c5cceb5c9e8d5200d99068022d5abf37cfd26570d69bc31fb9338bbdd' 
  AND token = 'u9k/MibS0sHFkxDnPzTbakBZ7BNWxkyhVnSnaUqJ6Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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