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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a469af2be4eca6748a578046217294d4c60d9732c72782d978ccbcf2726c5d' 
  AND token = '/nt3c6kZDg3usabeEBETLZwKip3+Hpw4vPHyV10+IZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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