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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe671ddb94b121702c8f862d1dc520c461604290a7bc741d5c4a1d30e41c9b1' 
  AND token = '2I9GEQwf/aYltcevUiy9ldVjz07BPFvRocsUVAhy4DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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