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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5d839afaba3304d6b35b3d7f910a448930cf39839579305786dd7f79fc2d3b' 
  AND token = 'iCzEJ9K7HK03hTyaoyRMbHjMMgf0PGoip/mUsD235v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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