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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e047aaac2ba59c16733a5db081f9f212bf5e31ee7ecadea285c03219d3864c9d' 
  AND token = 'FlM34Ib3PUJQPHhB4bJ0VFR+ewSbAIfWmo0sE8y5p+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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