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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58fe4a2b0a65c8d03cc2095ca7e344d65eee2bfd618e6d8be47d321b359591c2' 
  AND token = 'g0zWMp/eZis/eDA45m5IcTHXyaZO4RRUFw6tZagaHxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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